Energy storage is entering a new stage. The rapid expansion of battery energy storage systems (BESS) is beginning to show that, once these systems reach sufficient scale, they not only provide flexibility to power systems but can also reshape system operation, hourly price profiles, and the very economic conditions that determine the value of storage. This Technical Note examines that transformation and its implications for Latin America and the Caribbean (LAC), at a time when BESS deployment is beginning to accelerate across the region.
As of August 2026, OLACDE member countries have 3.4 GW of BESS in operation, more than twice the level recorded in 2025, with growth heavily concentrated in Chile, which already exceeds 2.3 GW and has become the first market where storage reaches systemic scale. Other countries show clear signs of growth through different models: Mexico has introduced storage requirements attached to new renewable generation; Brazil is advancing on regulation and dedicated auctions; Honduras uses storage to strengthen the grid; Argentina is integrating it through competitive mechanisms; and Jamaica is combining it with new renewable generation in island systems.
As BESS reaches scale, they begin to transform system operation by shifting energy across hours, modifying net demand, and altering dispatch. In markets with high solar penetration, storage moves from responding to prices to helping them: charging during hours of abundance introduces new demand and can raise the lowest prices, while discharging during hours of higher net demand adds supply and can moderate the highest prices. This changes the hourly price profile and, with it, transforms the sources of value for storage itself, which comes to require a more dynamic revenue structure based on ancillary services and other system needs.
The expansion of BESS also poses challenges for planning, regulation, and market design, which must adapt in order to recognize and adequately remunerate flexibility services, define connection and operating rules, and create mechanisms that make investments bankable. The region faces key decisions: identifying what flexibility needs exist, what services are required, where and for how long, and which technologies can meet them efficiently.
Taken together, the evidence shows that LAC is in transition from the deployment of batteries as isolated projects toward the growing integration of storage. The challenge in this new stage is to identify and manage the flexibility that increasingly renewable power systems will require, and to create the regulatory and market conditions that allow the solutions capable of providing it to develop efficiently and sustainably.
